The hum in a transformer is mainly attributed to – McqOptions

MCQOPTIONS

1.	The hum in a transformer is mainly attributed to
A.	load changes
B.	oil in the transformer
C.	magnetostriction
D.	mechanical vibrations
Answer» D. mechanical vibrations

Discussion

No Comment Found

Related MCQs

When does happen from the source to the load?
A transformer is plugged into a 120 V rms source and has a primary current of 300 mA rms. The secondary is providing 18 V across a 10 load. What is the efficiency of the transformer?
What is the turns ratio of the transformer needed to match a 1 k source resistance to a 160 load?
A transformer turns ratio of ________ will be needed to match an output impedance of 5 k to an 8 speaker.
The changes in volume of transformer cooling oil due to variation of atmospheric temperature during day and night is taken care of by which part of transformer
The full-load copper loss of a trans¬former is 1600 W. At half-load, the copper loss willbe
In a step-down transformer, there is a change of 15 A in the load current. This resultsin change of supply current of
In an actual transformer the iron loss remains practically constant from noload tofullload because
The no load current in a transformer lags behind the applied voltage by an angle ofabout
The efficiencies of transformers compared with that of electric motors of the samepower are